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Junior — Middle

Can you name the main types of table joins in SQL and their features?

sobes.tech AI

Answer from AI

Main types of JOINs in SQL:

  • INNER JOIN — returns only the records that match the condition in both tables.
  • LEFT JOIN (LEFT OUTER JOIN) — returns all records from the left table and the matching records from the right; if there are no matches, NULLs will appear on the right side.
  • RIGHT JOIN (RIGHT OUTER JOIN) — the opposite, all records from the right table and the matching ones from the left.
  • FULL JOIN (FULL OUTER JOIN) — returns all records from both tables, with NULLs in places where there are no matches.
  • CROSS JOIN — Cartesian product of two tables, returning all possible combinations of rows.

Example of INNER JOIN:

SELECT users.name, orders.id
FROM users
INNER JOIN orders ON users.id = orders.user_id;